[Analysis of fat content and fatty acid composition of aquaculture products in Hainan Province].

OBJECTIVE: To investigate the composition of fat and fatty acid in 12 kinds of aquaculture products in Hainan Province. METHODS: A total of 12 aquatic products were monitored in 8 breeding bases in Hainan Province, the edible parts were tested for fat and fatty acid. The content and composition of fat and fatty acid were analyzed. RESULTS: A total of 12 aquaculture products were monitored, including 6 freshwater aquaculture products and 6 mariculture aquatic products. The contents of crude fat and total fatty acid(TFA) ranged from 1.2 to 20 g/100 g edible and 1.0 to 15 g/100 g edible, and they were positively correlated(r=0.989, P<0.01). A total of 18-30 fatty acids were detected. Among them, 12 were saturated fatty acids(SFA), ranging from 0.34 to 6.4 g/100 g edible, mainly palmitic acid, eight were monounsaturated fatty acids(MUFA), mainly oleic acid. Ten were polyunsaturated fatty acids(PUFA), ranging from 0.28 to 2.6 g/100 g edible, It was mainly composed of linoleic acid(LA), docosahexaenoic acid(DHA), α-linolenic acid(ALA) and eicosapentaenoic acid(EPA). CONCLUSION: The composition of fatty acid in aquaculture products in Hainan Province is mainly unsaturated fatty acids(UFA), and most aquatic products are rich in n-3PUFA, and the ratio of n-6PUFA to n-3PUFA is less than 6, which has high nutritional and health value, and is beneficial to the nutritional diet balance of of population.

Concentration, correlation, and health risk assessment of rare earth elements in different edible parts of the swimming crab (Portunus trituberculatus) in Shandong Province, China.

This study is the first work investigating the distribution of rare earth elements (REEs) in three different edible tissues of the swimming crab (Portunus trituberculatus) collected from seven cities of Shandong Province, China. The total concentrations of REEs ranged from 26.1 to 139 ng/g with an average of 63.0 ng/g. The ratio of light REEs to heavy REEs ranged from 9.78 to 16.6 ng/g with an average of 11.5 ng/g. There was no significant differences in REE levels between the edible tissues of male and female crabs. The content of REEs across different tissues followed a consistent pattern: gonads > body muscle > legs muscle, except for Eu. A significant correlation was observed between REEs in P. trituberculatus and marine sediments in the corresponding sea area, following the principle of "abundance law". A health risk assessment revealed a low health risk of REEs for local adults and children consuming Portunus trituberculatus.

Residual levels of rare earth elements in freshwater and marine fish and their health risk assessment from Shandong, China.

The total concentrations of rare earth elements (ΣREE) were quantified in 251 samples from 10 common species of freshwater and marine fish in seventeen cities of Shandong, China. ΣREE obtained from the freshwater fish ranged from 34.0 to 37.9ngg(-1) (wet weight) and marine fish from 12.7 to 37.6ngg(-1). The ratio of LREE to HREE was 13.7:1 and 10:1 for freshwater and marine fish, respectively. This suggests that freshwater fish exhibit greater REE concentrations than marine fish and the biological effects of LREE are higher than HREE. Results revealed a similar REE distribution pattern between those fish and coastal sediments, abiding the "abundance law". The health risk assessment demonstrated the EDIs of REEs in fish were significantly lower than the ADI, indicating that the consumption of these fish presents little risk to human health.